This is the first edition of the Middle English version of an influential treatise on governance entitled De Regimine Principum. The first volume contains a critical text of the Middle English prose and second will provide an introduction, textual notes and a glossary. Aegidius Romanus (Giles of Rome), an Augustinian friar and professor of theology at the University of Paris, composed the Latin treatise that underlies the Middle English text toward the end of the reign of the French king Philip III (1270-85). The work was addressed to the king’s son, who succeeded his father as Philip IV, know as the Fair (1285-1314).This edition first published in 1997. Routledge is an imprint of Taylor & Francis, an informa company.